SOHC.co.uk Forums > CB350/400
CB400F Frustrations - Not firing, low compression (Cyl Block now off)
ManicGTI:
It's up in Cuffley, my Sister is living there and has an empty garage, well it was empty...now it's full of my stuff!
tom400f:
Well at least the garage is being put to good use ::)
I can get there fairly easily if you ever want a second opinion... my bikes are in Southgate Road btw
Cheers
Tom
ManicGTI:
Haha! Now I'm really sad I don't have the CB down with me...I'm only just up on Mildmay Park Rd. Thanks for the offer, appreciated, practically I think it'll be a few weeks until I can get up there to have a look anyway.
ManicGTI:
So some progress! Good and bad news, pulled the head and cylinder block yesterday.
- Exhaust Valve on cylinder 3 has as chunk missing, so that's the source of the low compression. Tempted to clean it up, get a replacement Valve and lap the valves back in rather than a full rebuild.
- Piston on Cylinder 1 had a broken ring which seems to have damaged the Ringland, so it'll need 'at least' one piston.
All the pistons are Honda marked, and none of them have markings on the crown to show oversize. There's some marks on the outside of them, and a few length ways marks in the bores. Nothing I can feel with my nail though.
I've taken images of all the pistons: https://drive.google.com/folderview?id=0B3qBPnS1cCGlNktETm9xbXNRN00&usp=sharing
Any views would be appreciated, advice on checking that they're in spec?
Does anyone know of an engine place in London (Pref NE or SW) that could take a look at my cylinder block and pistons before I decide where to go next?
If I get it honed would I need to change all pistons and rings?
Trigger:
Any skimping on a engine will bite you back later. What is the cam shaft like ?
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